Who is going to keep them accountable? Trees have a record high abstention rate, and if these representatives are elected by humans that’s just proportional voting with veneer on top.

Democracy is about balancing levers, and that’s why there is more than one branch of government. Special interest groups do have power, and so does the judiciary (who may sue the government for unlawful cutting down of trees) and the executive (who may have power to declare certain government-owned land to be Protected).

The real ecologist move would be to write a duty to protect the environment into the constitution, so that the judiciary can strike down any law that does anything to the contrary.